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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2021.0631.2 cURL vulnerability CVE-2020-8284 14 September 2021 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: BIG-IP Traffix SDC Publisher: F5 Networks Operating System: Network Appliance Impact/Access: Access Confidential Data -- Remote/Unauthenticated Resolution: Patch/Upgrade CVE Names: CVE-2020-8284 Reference: ESB-2020.4506 ESB-2020.4364 ESB-2020.4343 Original Bulletin: https://support.f5.com/csp/article/K63525058 Revision History: September 14 2021: Vendor updated versions known to be vulnerable February 19 2021: Initial Release - --------------------------BEGIN INCLUDED TEXT-------------------- K63525058: cURL vulnerability CVE-2020-8284 Original Publication Date: 19 Feb, 2021 Latest Publication Date: 13 Sep, 2021 Security Advisory Description A malicious server can use the FTP PASV response to trick curl 7.73.0 and earlier into connecting back to a given IP address and port, and this way potentially make curl extract information about services that are otherwise private and not disclosed, for example doing port scanning and service banner extractions. (CVE-2020-8284) Impact If curl is used from the F5 product and it connects to a malicious FTP server, an attacker can manipulate curl to access restricted information. Security Advisory Status F5 Product Development has assigned ID 978441 (BIG-IP) ID 978441-6 (BIG-IQ), ID 999345 (F5OS), and CPF-25231 (Traffix) to this vulnerability. To determine if your product and version have been evaluated for this vulnerability, refer to the Applies to (see versions) box. To determine if your release is known to be vulnerable, the components or features that are affected by the vulnerability, and for information about releases, point releases, or hotfixes that address the vulnerability, refer to the following table. For more information about security advisory versioning, refer to K51812227: Understanding security advisory versioning. +-------------------+------+----------+----------+--------+------+------------+ | | |Versions |Fixes | |CVSSv3|Vulnerable | |Product |Branch|known to |introduced|Severity|score^|component or| | | |be |in | |1 |feature | | | |vulnerable| | | | | +-------------------+------+----------+----------+--------+------+------------+ | |16.x |16.0.0 - |None | | | | | | |16.0.1 | | | | | | +------+----------+----------+ | | | | |15.x |15.1.0 - |None | | | | | | |15.1.2 | | | | | |BIG-IP (LTM, AAM, +------+----------+----------+ | |curl/libcurl| |Advanced WAF, AFM, |14.x |14.1.0 - |None | | |(Command | |Analytics, APM, | |14.1.3 | | | |Line | |ASM, DDHD, DNS, +------+----------+----------+Low |3.1 |Interface, | |FPS, GTM, Link |13.x |None |Not | | |EAV | |Controller, PEM, | | |applicable| | |Monitors, | |SSLO) +------+----------+----------+ | |iRules) | | |12.x |None |Not | | | | | | | |applicable| | | | | +------+----------+----------+ | | | | |11.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+--------+------+------------+ | |8.x |8.0.0 |None | | | | | +------+----------+----------+ | |curl/libcurl| |BIG-IQ Centralized |7.x |None |Not | | |(Command | |Management | | |applicable|Low |3.1 |Line | | +------+----------+----------+ | |Interface) | | |6.x |None |Not | | | | | | | |applicable| | | | +-------------------+------+----------+----------+--------+------+------------+ | | | | | | |curl/libcurl| | | |1.0.0 - | | | |(Command | |F5OS |1.x |1.1.4 |None |Low |3.1 |Line | | | | | | | |Interface, | | | | | | | |confd) | +-------------------+------+----------+----------+--------+------+------------+ |Traffix SDC |5.x |5.1.0 |None |Low |3.1 |curl/libcurl| +-------------------+------+----------+----------+--------+------+------------+ ^1The CVSSv3 score link takes you to a resource outside of AskF5, and it is possible that the document may be removed without our knowledge. Recommended Actions If you are running a version listed in the Versions known to be vulnerable column, you can eliminate this vulnerability by upgrading to a version listed in the Fixes introduced in column. If the table lists only an older version than what you are currently running, or does not list a non-vulnerable version, then no upgrade candidate currently exists. Mitigation o Restrict the Management Interface access to only trusted users. For more information regarding the BIG-IP system, refer to the following article: K13092: Overview of securing access to the BIG-IP system. o Connect to only trusted FTP servers. o Use the following curl command line option: --ftp-skip-pasv-ip This option causes curl to ignore the IP address that the server suggests for the data connection. Instead, curl uses the same IP address it is using for the control connection. For example: curl --ftp-skip-pasv-ip -k -u user ftp://10.1.1.100/get_file -o /shared/tmp /get_file Note: This could cause problems in situations where you expect the server to need the client to connect back to an IP address other than the control connection IP address. o If feasible, use the --ftp-skip-pasv-ip mitigation with the EAV monitors or iRules that use curl to access the FTP servers, or just remove the EAV monitors or iRules. Supplemental Information o K41942608: Overview of security advisory articles o K4602: Overview of the F5 security vulnerability response policy o K4918: Overview of the F5 critical issue hotfix policy o K9502: BIG-IP hotfix and point release matrix o K13123: Managing BIG-IP product hotfixes (11.x - 16.x) o K15106: Managing BIG-IQ product hotfixes o K15113: BIG-IQ hotfix and point release matrix o K167: Downloading software and firmware from F5 o K9970: Subscribing to email notifications regarding F5 products o K9957: Creating a custom RSS feed to view new and updated documents - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AusCERT's members. As AusCERT did not write the document quoted above, AusCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AusCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://www.auscert.org.au/bulletins/ =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). 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